Combinatorics '81, In Honour Of Beniamino Segre: Proceedings Of The International Conference On Combinatorial Geometrics And Their Applications, Rome, June 7-12, 1981 Combinatorics Eighty One, In Honour Of Beniamino Segre

Combinatorics ' 81 in Honour of Beniamino Segre Copyright Page Contents Preface Chapter 1. Address to Participants Chapter 2. Beniamino Segre Chapter 3. Complete arcs in PG (2,q), q even Chapter 4. Intorno ad un teorema di Buekenhout sulle ovali pascaliane Chapter 5. Orthogonality in reflection geometry Chapter 6. On some translation planes admitting a Frobenius group of collineations Chapter 7. Hall triple systems and related topics Chapter 8. On mappings preserving a single Lorentz-Minkowski- distance. I Chapter 9. Designs obtained from affine spaces Chapter 10. On the codes generated by certain divisible designs Chapter 11. On a characterization of the Grassmann spaces associated with an affne space Chapter 12. On a characterization of Grassmann space representing the h-dimensional subspaces in a projective space Chapter 13. Enriched cliques with six vertices Chapter 14. Blocking sets in affine planes Chapter 15. Some building geometries of spherical type as sets of points and lines Chapter 16. “Cyclic” solutions for finite projective planes Chapter 17. Points and lines in metasymplectic spaces Chapter 18. On generalized perfect codes and Steiner systems Chapter 19. Greedy colouring of Steiner triple systems Chapter 20. Concurrence geometries Chapter 21. (q2+q+1)-sets of type (0,1,2,q+1) in translation planes of order q2 Chapter 22. The embedding of (0,α)-geometries in PG(n,q). Part I Chapter 23. On cubic surfaces over a field of characteristic 3 Chapter 24. Some characterizations of finite 3 -dimensional projective spaces and affine-projective planes Chapter 25. On a problem of A. Kotzig Chapter 26. A small 4-design Chapter 27. Some new generalizations of sharply t -transitive groups and sets Chapter 28. Dissections of polygons Chapter 29. Group modifications of some partial groupoids Chapter 30. Bireflectionality Chapter 31. A graphic characterization of hermitian curves Chapter 32. On the connectivity of maximal planar graphs with minimum degree 5 Chapter 33. Affine geometries obtained from projective planes and skew resolutions on AG(3,q) Chapter 34. Automorphisms and generalized incidence matrices of divisible designs Chapter 35. Some results on partial Steiner quadruple systems Chapter 36. Some recent results on cylic Steiner quadruple systems - A survey Chapter 37. On a conjecture of S. Ilkka Chapter 38. On homologies of fixed-point-free affine groups Chapter 39. On Pellegrino’s 20 -caps in S4,3 Chapter 40. Caps in elliptic quadrics Chapter 41. On Cohnfunctions Chapter 42. A class of strongIy regular graphs related to orthogonal groups Chapter 43. On the non-existence of a semi-symmetric 3-design with 78 points Chapter 44. On certain linear congruence class geometries Chapter 45. Translation planes of characteristic p that admit SL(2,pr) Chapter 46. Nondesarguesian planes, partial geometries, strongly regular graphs and codes arising from hyperbolic quadrics Chapter 47. The projectivity groups of ovals and of quadratic sets Chapter 48. On R-sequenceability and Rh-sequenceability of groups Chapter 49. On the characterization of finite miquelin möbius planes Chapter 50. A physical characterization of conformal transformations of Minkowski spacetime Chapter 51. The van der waerden conjecture Chapter 52. Some extremal results about the genus of a pair of permutations Chapter 53. Partial parallelism spaces and slit spaces Chapter 54. On a class of kinematic spaces Chapter 55. A brief survey of covering radius Chapter 56. A graphic characterization of the lines of an affine space Chapter 57. Z2-cohomology of projective spaces of odd order Chapter 58. Inequalities for point stable designs Chapter 59. On the structure of translation generalized quadrangles Chapter 60. Sur les k-arcs complets des planes de Galois d'ordre impair Chapter 61. The bundles axiom and egglike subsets of projective spaces Chapter 62. Kirkman cubes Chapter 63. Sulle ovali dei piani desarguesiani finiti d'ordine pari Chapter 64. Groups on points and sets Chapter 65. An application of combinatorics of Young tableaux to geomeric problems Chapter 66. Two characters k-sets with respect to a singular space in PG(r,q) Chapter 67. Moufang conditions of finite generalized quadrangles Chapter 68. Nilinearly generated near-algebras Chapter 69. Affine planes and latin squares Chapter 70. Composition of rotations of graphs Chapter 71. A survey on varieties of PG(4,q) and Baer subplanes of translation planes Chapter 72. On travalent graphs embedded in twisted honeycombs Chapter 73. Restricted Mi-spaces, restricted Li-spaces, optimal codes and n-arcs Chapter 74. Sur des classes de groupes finis résolubles Chapter 75. Finite non-euclidean planes Chapter 76. Other talks List of participants